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  1. PermanentCharpy

    Passivate after hardstamping stainless steel

    I have received a number of parts that I need to stamp heat numbers to for traceability. The stamps are made of an unknown material, but do not seem to be corroded in any way, so perhaps they're stainless too, but I doubt it. Should I passivate the stamped area of the parts after I have hand...
  2. PermanentCharpy

    Wear Rate - Influencing factors and their weighted effects

    Good day all, Without going into too much detail, I have a piston which reciprocates inside a hardened sleeve, lubricated by an oil/water mixture. The piston is a sacrificial part in the larger system and is manufactured with wear rings machined into the outer diameter. Once the rings are no...
  3. PermanentCharpy

    F22 to X80 - Shop with WPS

    Good morning all, I am looking for a shop with a qualified WPS for ASTM A182 F22 to API 5L Gr. X80 Pipe in the greater Houston, TX area.
  4. PermanentCharpy

    Post Hydrotest Non-Destructive Examination

    I am manufacturing a set of pressure testing caps (blanks) which are threaded onto a length of pipe 3"IDX6"OD Pipe which is then hydro-tested to 22 500 psi. These parts are manufactured from AQ&T AISI 4130. During manufacture, volumetric and surface NDE are conducted after heat treatment and...
  5. PermanentCharpy

    Niobium Content effect on weldability

    Good day all, I am looking at an ASTM A519 4130 heat for welding (the only material we can find which is close to size). The heat has a far higher Niobium content than our spec - 0.029 (heat analysis) vs 0.010 (spec). Fortunately the Carbon Equivalent (IIW) is within spec - 0.72 (analysis) vs...
  6. PermanentCharpy

    4130 Hardenability

    I am having parts manufactured from AISI 4130 (80KSI Yield). The parts are 9.00" OD x 4.50" ID X 20.00" LNG (approximately, with some internal details, threads etc). The shop making these didn't quote for heat treating after roughout, which I have now requested. I am having a bit of friction...
  7. PermanentCharpy

    Corrosion Allowance versus Design Thickness

    Good day all, When corrosion allowances are specified (ie: maximum 2mm on the ID etc), is this allowance taking into account degradation of the material due to this corrosion in the form of micro structural effects (embrittlement etc). In other words: A pipe of 10" x 1.0" WT corrodes to...

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